the absolute first thing you should check if you loose both engine generators is look down and make sure the engines are still running...
Indeed true of any Gen OFF BUS scenario. In a low thrust scenario, even idle descent, an engine flameout will throw up a GEN OFF BUS first and the CWS will divert your eyes overhead to the SOURCE off light. It is very easy to rush, and there will be little yaw at idle thrust, especially if A/P in CMD. A little aileron displacement may give a clue, but on a dark night the bright CWS ELEC can be very captivating.